Wood-turning machine



April 14, 1942.- L H ADL Y 2,279,730

WOODTURNING MACHINE Filed March 6, 1959 3 Sheets-Sheet l o I o 4 ////////////IIIIIIIIIII4 INVENTOR IVAN H. BRADLEY I. H. BRADLEY WOODTURNING MACHINE April 14, 1942.

I Filed March 6, 1939 3 Sheets-Sheet 2 INVENTOR IVAN H. BRADLEY TTORNEY 2 April 14, 1942,. 1. H. BRADLEY WOODTURNING MACHINE Filed Mafch 6, 1939 3 Sheets-Sheet 3 l I l l INVENTOR \VAN H. BRADLEY Patented Apr. 14, 1942 UNITED STATES PATENT OFFICE WOOD-TURNING MACHINE Ivan H. Bradley, Stratford, Conn. Application March 6, 1939, Serial No. 260,177

Claims.

This invention relates to new and useful improvements in woodworking machinery and has particular relation to automatic woodturning machines.

The objects and advantagesof the invention will become apparent from a consideration of the following detailed description taken in connection with the accompanying drawings wherein a satisfactory embodiment of the invention is shown. However, it is to be understood that the'invention is not limited to the details disclosed but includes all such variations and modifications as fall within the spirit of the invention and the scope of the appended claims.

In the drawings- 4 Fig. l is a side elevational view of my improved machine;

Fig. 2 is a top plan view of the machine;

Fig. 3 is an end elevational View taken as looking from the right in Fig. 1. certain parts being omitted;

Fig. 4 is a detail sectional view taken as along the plane of the line 4-4 of Fig. 1;

Fig. 5 is an enlarged longitudinal sectional view of the work holding chuck and the spindle mounting the same;

Fig. 6 is a further enlarged detail sectional view of a portion of the chuck opening and closing means; and

Fig. 7 is a detail view showing one of a pair of dogs employed for connecting the -chuck and the means for opening and closing the same.

Referring in detail to the drawings the machine comprising my invention is shown as comprising abase generally designated Ill and adaptedto be disposed on a bench or the like not shown. Base l0 includes a bed portion front and rear side wall portions I2 and I3 respectively located toward one end of the base and end walls l4 and IS. The entire base is preferably cast in one piece as shown. On one end of the bed I is a housing-like means l6 which at its upper side supports an electric motor used for the driving of the machines spindle and cam shaft as will appear.

On thebed of the machine is a forward hearing l8 for the spindle and also a rearward bearing IQ for the spindle. These bearing members may be secured to the machine bed in any suitable manner. The machines spindle is generally designated 20 and is rotatably mounted by the mentioned bearings and includes an outer spindle or sleeve 2| mounted in the bearings and in fact extending through each of them. At its rear end the sleeve is simply mounted in the bearing H which includes anti-friction means 22 and dust excluding means 23.

The forward bearing l8 also includes dust excluding means 24 and anti-friction means 25 the inner raceway 26 of the latter being clamped in place on the sleeve 2| as by means of a nut 21. Threaded to the forward end of the sleeve 2| is a cone or nosepiece 28 having an inclined inner surface portion 29 to cooperate with the inclined outer surfaces of the. fingers of a collet chuck 3|] in the usual manner whereby to cause the chuck to close and grip a piece of work when the chuck is drawn inwardly of the said cone. Threaded or otherwise connected with the inner end of the chuck 30 is an inner spindle 3| hollow as in the case of the sleeve or outer spindle 2| and having the opening therethrough in alignment with the opening through the chuck whereby work may be fed through the spindle and chuck from the inner or rear end of the spindle.

Secured to the sleeve 2| are pulleys 32 over which are trained belts 33 driven by large pulleys 34 on the shaft 35 of the electric motor ll. As the sleeve 2| is driven or rotated the chuck 30 and the inner spindle 3| are also driven or rotated. Means (later to be described) serve to shiftthe chuck 30 to and from gripping relation to the work in timed relation to the operation of means which acts on the work and which latter means is now to be described.

A small pulley 36 on the motor shaft 35 has'a belt 31 trained thereover and such belt from the motorserves to drive a pulley 38 secured on a counter-shaft 39 mounted in a bearing member 40 located at the rear side of the machine. Belt 31 also passes over a guide pulley 4| mounted on the frame part l6. Secured to the rear end portion of the shaft 39 is a gear 42 meshing with a gear 43 having fixed thereto a gear 44. Gears 43 and 44 are mounted on a short shaft (not shown) carried by an arm 45 adapted for pivotal movement about the shaft 38, the said arm being carried by or including a short sleeve-like portion 46 about said shaft.

Small gear 44 meshes with and transmits power 'to a-larger gear 41 fixed with respect to a pinion not shown, and which pinion meshes with and drives a gear 48 fixed to a cam shaft 49 having bearing in the end walls I4 and I5 and an interwhereby to have the cam shaft 49 driven by the motor I! or to have such shaft stationary as may be desired.

The material to be acted upon by the machine may be fed by automatic means or by hand as may be desired. Such material is fed through 1 the rear end of the sleeve 2| and through the inner hollow spindle SI and into and through the chuck. The material projecting beyond the forward end of the chuck is acted upon by suitable tools depending on the shape, size, and the like of the finished piece. In the drawings a stop finger 52 limits the distance the work may be projected beyond the forward end of the chuck.

Finger 52 passes through a guide block 58 adjustable along a supporting bar 84 arranged to extend longitudinally of the machine base and secured at its respective ends as at 55 to thebearing I8 and at 56 to the upper end portion of a supporting rod 51 suitably secured on the bed of the machine. At its upper endfinger 52 is secured to an actuating bar 58, such bar having a slot 88 therein through which passes a pin 88 securing the finger to the bar whereby the finger may be. adjusted longitudinally of the bar to determine the length of the work that may be projected beyond the forward end of the chuck. Obviously the guide block 53 is adjustable along the bar 54. Remote from the finger 82 the actuating bar 58 is pivotally mounted on the upper end portion of the rod 51 at 8|.

An operating rod 62 passing vertically through the bed II and a guide means 88 thereon, has its upper end pivotally connected with the actuating bar 58 at 88. At the under side of the bed II a coil spring'65 surrounds the rod 82 and bears on the bottom surface of the bed and a stop 88 fixed to the rod. The tendency of this spring isto move the rod 82 downwardly and to keep the lower end of the rod against the surface of a cam 81 fixed to the cam shaft 48. Obviously the lower end of the rod 82 may be equipped with a roller to ride against the cam 81.

A bracket 88 on the bed II supports a shaft 88 pivotally mounting a tool carrier I8 supporting a tool II adapted to act on work projecting from the forward end of the chuck 38 at preof the parts is such that the chuck is closed to grip the work and the cam 81 acts on the rod 82 (against the tendency of the spring II) to raise the rod 82 and thus the bar 88 and thereby elevate the finger 52 to an out of the way position.

Now cam I4 comes into play and acting on extension I2 rocks the tool carrier II on pivots 88 to bring the tool II against the work being held by the chuck. As the work of the tool is completed the high portion of cam 14 recedes and the spring 1! acts to retract the tool carrier and thus the tool. 'At this time the cam 81 acts on the roller 88 and rocks the platform 88 (through the arm 18) to bring the saw 88 into action to cut off the shaped piece from the rod being fed through the machine. Obviously as the high portion of cam 81 "recedes the spring 88 will act to bring'the platform back to normal position with the saw spaced from the work.

The means for shifting the chuck between gripped and released positions is hydraulically actuated whereby to have the work gripped with the same predetermined pressure regardless of minor variations in the diameters and shapes of the rods fed the machine for treatment thereby.

Disposed on the bed II intermediate the bearings I8 and I8 is a block 8| having an opening 82 therethrough and through which the spindle ends of the block 8i serve to close the openings determined times as will be described. Carrier C II includes .an extension I2 equipped at its lower end with a roller I8 riding against a cam 18 also fixed to the cam shaft 88. A coil spring II fixed at one end to the base wall I8 and at its other end to a piece 18 on the extension I2 serves to maintain the extension in position with the roller I8 against the cam I4 and thus the spring serves to move the tool 'II to a retracted position away from the work as the high portion of the cam moves from under the roller.-

At the rear side of the base [8 is located a bracket "supporting a short shaft 18 pivotally mounting an arm I8 carrying a platform 88. On the platform 88 is mounted an electric motor 8| which through pulleys 82 and 83 and a belt 84 drives a disc saw 85. The lower end of the.

. ment of such work. Thus the work will be permitted to project only a predetermined distance from the forward end of the chuck. Now the work having been positioned the timed relation.

82 about the skirt portion of the piston 88 whereby to have the block form a cylinder about the piston. Bolts 88 serve to secure the ring-like members in place and at the inner sides of such members are sealing rings or means each comprising a metal ring 88 having openings I88 therein and expansible leather or the like rings I8I located in back of the rings 88 and adapted to be expanded by the fluid under pressure passing through the openings I88 in said rings 88.

Liquid under pressure is supplied to operate the piston 83 first in one direction and then in the opposite direction. As here shown the liquid is maintained in a suitable reservoir I 82 preferably located below the bench or other support on which the machine may be located. A pump I88 driven by an electric motor I88 takes the liquid from the reservoir through a pipe I85 and delivers it under pressure into a tube I88 connected at its upper end with the intake port of a distributing valve I81.

A by-pass or pressure regulating valve means I88 provides for the by-passing back to the reservoir through the pipe I88 any excess liquid delivered by the pump and the device may be equipped with a pressure indicator 8 as desired. Distributing valve I81 alternately and in proper timed order delivers the liquid under pressure to the tubes III and H2 and such valve also has connected thereto a return pipe "-8 for the return to the reservoir of the liquid drained from one side of the piston as the liquid under pressure is being supplied to the other side thereof.

Valve I 81 is controlled by a cam Ill located on the cam shaft 49 above mentioned. Such 52, the tool II and the saw 85 all as will appear.

Tubes II I and H2 are connected to deliver liquid under pressure to opposite sides of the piston 93. To this end elbow fittings Ill and H8 connect the respective tubes (see Figs. 5 and 6) III and H2 whereby to have the former deliver to the outer side of piston part 05 while the latter delivers to the outer side of the piston part 96. Thus when the valve I'I delivers liquid under pressure to the tube I I2 the piston will be moved toward the rear of the machine or toward the left as viewed in Figs. 1, 2, 5 and 6 and when the tube III has liquid under pressure delivered thereto the piston will be moved toward the forward end of the machine or toward the right in such figures.

The forward end of the skirt portion or sleevelike portion 94 of the piston has threaded or otherwide secured thereon an annular extension II9 of enlarged diameter. Such extension overlies the rear end portions of slots I20 located at opposite sides of the sleeve 2|. Secured to opposite portions of the-inner spindle 3| and projecting through such slots are dogs I2| secured as by screws I22 and slightly recessed into the spindle 3| as at I23 (see Fig. 7).

An annular ring I24 is disposed over the dogs I2I and secured to them as by pins I25. Disposed on the ring I24 is the inner raceway I26 of a ball bearing means a nut I21 being threaded onto the'outer end of the ring and securing the said raceway in place. The outer raceway I20 of said ball bearing means is secured to the extension ||9 by a nut I29 threaded into the extension as shown.

Since .thedogs I2I project into the slots I20 and are secured to the inner spindle 3| by the screws I22 it will be clear that as the sleeve 2| is rotated by the belts 33 driving the pulleys 32 chuck releases the work for further movement forward to position its forward end portion for action by the tools.

A bracket |3I on' the bed II frictionally engages against the under side of the extension I I9 whereby to at least partly support the connection between the piston and the spindle 3| and also whereby through such frictional engagement prevent creeping of the extension with the inner rotatable parts of the connection. Onthe forward end of the cam shaft 49 is a hand wheel I32 by means of which the cam shaft 49 may be turned manually when setting the cams for the control of new tools. Should the machine stop with the chuck gripping the work then the wheel |32-should be manually turned a slight distance to have the chuck release the work. In Fig. 5 it is noted that the liquid under pressure isintroduced into the cylinder at the upper side thereof whereby the liquid does not completely drain from the cylinder when the. machine is stopped and therefore the operating pressure may be more readily obtained.

Afterthe machine has been in use the owner thereof may change chucks and in doing so may insert into the machine a chuck which is too long or too short or of the wrong diameter. Under such circumstances with an established throw for the piston the chuck may not open properly when the piston operates in one direction or it may not close properly when the piston is operated in the opposite direction. To compensate for this I provide anadjustment including a nutlike means I33 threaded on the rear or inner end of the skirt portion or sleeve like portion 94 of the piston. On tightening or loosening of this nut a greater or lesser throw is allowed the piston whereby to prevent too much or too little opening of the chuck which is not an exact duplicate of the chuck accompanying the machine when it leaves the factory.

Having thus set forth the nature of my invention, what I claim is:

such rotating motion of the sleeve 2| will be positively transmitted to the inner spindle whereby the outer spindle or sleeve 2|, the inner spindle 3| and the chuck 30 will be rotated together. However, with the ball bearings I30 located between the raceways I26 and I28 it will be apparent that such rotary motion is not transmitted to the extension H9 and thus is not transmitted to the piston 93. Due to the construction described it will be understood that any movement of the piston longitudinally of the sleeve 2| will result in similar movement of the inner spindle 3| and of the chuck 30. The end thrust is delivered through the ball bearings.

Thus viewing Fig. 5 on liquid under pressure being delivered to the cylinder by the tube II2 the piston will be moved'to shift the inner spindle 3| to draw the chuck into the cone 23 whereby the chuck will be caused to grip any work projecting therethrough. Next the liquid under pressure is delivered through tube II I and the piston, inner spindle and chuck are moved in the opposite direction and the chuck expands and releases the work. The various cams cause the operations of the various parts to be in such timed relation that while the chuck is gripping the work the same is turned to shape by the tool II and then cut oil by the saw 85 after which the 1. In combination, an elongated hollow rotary spindle, a chuck at the forward end of said spindle, means mounting said spindle and chuck for rotary movement, said chuck movable longitudinally of the spindle in one direction to grip the work and in the opposite direction to release the work, a tubular piston about said spindle in spaced relation to said chuck, said piston movable longitudinally of the spindle, said spindle rotatable in said piston, a stationary cylinder aboutsaid piston, driving means on the spindle between the piston and chuck and through which the spindle and chuck may be rotated, means for I supplying fluid under pressure alternately to opposite sides of the piston to shift it longitudinally of the spindle, means connecting the piston with the chuck for alternately opening and closing the latter as the piston is moved by said fluid under pressure, and said connecting means including a rotatable part on the spindle and a nonrotatable part on the piston whereby the spindle is rotated independent of the piston and the latter is not rotated in the cylinder.

2. In combination, an elongated hollow rotary outer spindle, a chuck at the forward end of said outer spindle, means mounting said outer spindle and chuck for rotary movement, chuck operating means including an elongated inner spindle rotatable with said outer spindle and 'movable longitudinally thereof in one direction to cause the chuck to grip the work and in the opposite direction to cause the chuck to release the work,

a cylinder and piston construction, driving means on said outer spindle between said piston and cylinder construction and said chuck and through which the outer spindle and chuck may be rotated, means for supplying fluid under pressure alternately to opposite sides of said piston to shift it in the cylinder, means connecting the piston with the inner spindle for alternately moving the same longitudinally in opposite directions to close and open the chuck as said piston is moved by the fluid under pressure, said connecting means including a rigid rotatable part on the inner spindle and passing through the outer spindle whereby the former is rotated with the latter, and a non-rotatable part connected with the piston and said rotatable part whereby the outer and inner spindles andthe chuck are rotated insleeve having the chuck in one end thereof and adapted to have work fed therethrough and through the chuck, said chuck movable longitudinally of said sleeve between gripped and released positions, a hollow spindle within the sleeve and connected with said chuck, a tubular piston about said sleeve, means for supplying fluid under pressure alternately to opposite sides of said piston to move it back and forth on the sleeve, a connection between the piston and spindle whereby as the piston is moved back and forth the chuck is moved to gripped and released positions, said connection including dogs located in slots in said sleeve, means-connecting said dogs to said spindle, an extension on said piston and overlying said dogs, and a ball bearing means connecting said extension and dogs and located to accept thrust caused by movement of the piston without imparting turning movement of the spindle to the piston.

4; In combination, a base, a hollow rotary spindle, a chuck at the forward end of said spindle, means rotatably mounting said spindle and chuck on the base, said chuck movable longitudinally of the spindle in' one direction to grip the work and in the opposite direction to release the work, a tubular piston about a portion of said spindle supplying fluid under pressure alternately to opposite sides of said piston to shift it longitudinally of said spindle, means connecting the piston with the chuck for alternately opening'and closing the latter as the piston is moved by said fluid under pressure, said ineans including a nonrotatable part on the piston and a rotatable part on the chuck whereby rotation of the latter is not imparted to the former, means for rotating the chuck, and screw threaded means connected with said piston and operable to'adjust the same and thereby the chuck longitudinally of the spindle to adjust the end location of the chuck to prevent too much and too little opening thereof when shifted by said piston.

5. In combination, a base, a chuck, a hollow rotatable spindle having the chuck in theforward end thereof and adapted to have work fed posite sides of said piston to shift it longitudiand movable longitudinally thereon, means for nally of the spindle, means for rotating the chuck and spindle, means connecting the chuck and piston whereby as the latter is alternately moved in opposite directions the chuck is alternately moved to gripped and released positions, said last means including a rotatable means intermediate the chuck and, piston and connected with the chuck, a non-rotatable means between the chuck and piston and radially about said rotatable means and connected with the piston, bearing means between and connecting said rotatable and non-rotatable means whereby the chuck rotates independent of the piston, and a supporting means on said base forwardly of the spindle mounting means and frictionally engaging the underside of said non-rotatable means to assist insupporting and holding the same against rotation but yet permit of movement thereof with the piston.

IVAN H. BRADLEY. 

